Driveline Plus is a division of Technical Video

Identify My Transmission		Tools

Videos/DVDs		Books

TRANSFER CASE

Videos/DVDs

Books

AUTOMOTIVE VIDEOS/DVDS

Differential		Electrical

REBUILDER LINKS

GIFT CERTIFICATES

What Year Is My 700R4?

Use the serial number located just above the pan on the passenger side of the transmission (see Fig. 1 below). This first digit is the most important. This will indicate what year the transmission was built.

Note: GM used "9" for years 1982 AND 1989. The easiest way to identify between the two years is to look at the passenger side of the case. Any 700R-4 built before 1989 will have the pressure taps (see Fig. 2 below), while all units built after 1990 will not. With the pan off, all 1987 or later units had an auxiliary valve body.

If your looking for a 700R-4 that will hold up in a performance application, the clear choice is to build the 1989 or later models (without the pressure taps). These units have the larger input shaft, larger input sprag, 10 vane pump, and the updated gear train.
Figure 1 Models with the serial numbers ground off of the case are usually units rebuilt by GM. You should find a sticker on the bell housing with the new number.	Figure 2 Notice the three pressure taps on this side of the case. Only found on 1982-1988 and some 1989 models.	Figure 3 4L60E (electronically shifted 700s) produced 1992 and up. Can be identified by the large electrical connector just behind the 2-4 servo.